CN110550782A - method for reducing iron content in inlet water of electrodialysis system - Google Patents
method for reducing iron content in inlet water of electrodialysis system Download PDFInfo
- Publication number
- CN110550782A CN110550782A CN201910923083.4A CN201910923083A CN110550782A CN 110550782 A CN110550782 A CN 110550782A CN 201910923083 A CN201910923083 A CN 201910923083A CN 110550782 A CN110550782 A CN 110550782A
- Authority
- CN
- China
- Prior art keywords
- iron content
- reducing
- electrodialysis system
- filtering
- wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
Abstract
the invention provides a method for reducing the iron content in the inlet water of an electrodialysis system, which can effectively remove the iron content in the wastewater and optimize the traditional complex manganese sand filtration process only by modifying a dosing system of the traditional precipitation and filtration process, adjusting the pH value of the wastewater, adding chemicals and combining the adsorption effect and relevant reaction conditions.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a method for reducing the iron content in inlet water of an electrodialysis system.
background
The existing method for reducing the iron content in water mainly adopts a manganese sand filter, Fe 2+ is oxidized into Fe 3+ through aeration and contact oxidation to generate flocculent ferric hydroxide precipitate, and then the flocculent ferric hydroxide precipitate is filtered by a manganese sand filter material or decomposed and degraded through an oxidation technology.
Disclosure of Invention
in view of the above, the present invention provides a method for reducing the iron content in the inlet water of the electrodialysis system, which solves the above problems.
The technical scheme of the invention is realized as follows: a method for reducing the iron content of feed water to an electrodialysis system, comprising the steps of:
S1, adjusting the pH value of the wastewater to 5-8, adding 100-200 ppm of polyaluminium chloride, and fully reacting for 20-36 min through a pipeline mixer, wherein the polyaluminium chloride contains 8-12% of aluminium oxide and has a basicity of 55-65%;
S2, adding 0.3-1.4 ppm of cationic polyacrylamide for rapid stirring, wherein the stirring speed is 600-1000 rpm, and the stirring time is 12-20 min;
S3, adding 300-500 ppm of sodium hypochlorite at the outlet of the inclined tube sedimentation tank;
And S4, filtering the effluent of the sedimentation tank in a filter tank, wherein the filtering mesh number is 400-600 meshes, and filtering a small amount of non-precipitated floc.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a method for reducing iron content in inlet water of an electrodialysis system, which only needs to modify a dosing system of the traditional precipitation and filtration process, adjusts the pH value of wastewater, combines the control of relevant reaction conditions, can achieve the aim of effectively reducing the iron content in the wastewater by adding polyaluminium chloride, cationic polyacrylamide and sodium hypochlorite, combines the adsorption effect, combines iron colloid in the water and the polyaluminium chloride to form floc, adds the ionic polyacrylamide, rapidly stirs the mixture to enable molecules to strongly collide, releases large amount of heat and shortens the reaction time, effectively removes the floc when the wastewater enters an inclined tube precipitation tank, and can avoid the generation of undeposited trace colloid and microorganisms contained in the water in a rear-section bundle fiber filter tank to generate biological fouling, and the method reduces the process operation steps on the premise of optimizing the reaction effect, solves the problems that the manganese sand filtering process needs to add new equipment and facilities, and has large process transformation difficulty and large investment.
Detailed Description
In order to better understand the technical content of the invention, specific examples are provided below to further illustrate the invention.
The experimental methods used in the examples of the present invention are all conventional methods unless otherwise specified.
The materials, reagents and the like used in the examples of the present invention can be obtained commercially without specific description.
Example 1
S1, adjusting the pH value of the wastewater to be 5, adding 100ppm of polyaluminium chloride, and fully reacting for 20min by using a pipeline mixer, wherein the content of aluminum oxide in the polyaluminium chloride is 8%, and the basicity is 55%;
S2, adding 0.3ppm of cationic polyacrylamide, and quickly stirring at the stirring speed of 600rpm for 12 min;
S3, adding 300ppm of sodium hypochlorite at the outlet of the inclined tube sedimentation tank;
And S4, filtering the effluent of the sedimentation tank in a filter tank, wherein the filtering mesh number is 400 meshes, and filtering a small amount of non-precipitated floc.
Example 2
S1, adjusting the pH value of the wastewater to 8, adding 200ppm of polyaluminium chloride, and fully reacting for 36min by using a pipeline mixer, wherein the polyaluminium chloride contains 12% of aluminium oxide and 65% of basicity;
S2, adding cationic polyacrylamide with the concentration of 1.4ppm, and rapidly stirring at the stirring speed of 1000rpm for 20 min;
S3, adding 500ppm of sodium hypochlorite at the outlet of the inclined tube sedimentation tank;
and S4, filtering the effluent of the sedimentation tank in a filter tank, wherein the filtering mesh number is 600 meshes, and filtering a small amount of non-precipitated floc.
Example 3
S1, adjusting the pH value of the wastewater to 7, adding 150ppm of polyaluminium chloride, and fully reacting for 25min by using a pipeline mixer, wherein the content of aluminium oxide in the polyaluminium chloride is 10%, and the basicity is 60%;
S2, adding 1ppm of cationic polyacrylamide, and quickly stirring at the stirring speed of 800rpm for 15 min;
S3, adding 400ppm of sodium hypochlorite at the outlet of the inclined tube sedimentation tank;
And S4, filtering the effluent of the sedimentation tank in a filter tank, wherein the filtering mesh number is 500 meshes, and filtering a small amount of non-precipitated floc.
example 4
This example is different from example 3 in a method for reducing the iron content in the feed water of the electrodialysis system, in which the stirring speed is controlled to 500rpm in the step of S2.
Example 5
this example differs from example 3 in a method for reducing the iron content of the feed water of an electrodialysis system in that the filtration mesh number in step S4 is 300 mesh.
Comparative example 1
the difference between the comparative example and the example 3 is that in the method for reducing the iron content in the feed water of the electrodialysis system, 50ppm of polyaluminum chloride is added in the step of S1, and the mixture is fully reacted for 15min through a pipeline mixer.
Comparative example 2
the difference between the comparative example and the example 3 is that in the method for reducing the iron content in the inlet water of the electrodialysis system, in the step S2, 0.1ppm of polyacrylamide is added, and the stirring time is 10 min.
Comparative example 3
The difference between the comparative example and the example 3 is that in the method for reducing the iron content in the inlet water of the electrodialysis system, 200ppm of sodium hypochlorite is added at the outlet of the inclined tube sedimentation tank in the step S3.
Manganese sand filtering process
1. The process flow of the manganese sand filter is as follows: aeration → contact oxidation → adsorption filtration → backwashing
2. Operating process
aeration
According to the water quality condition, the method adopts the modes of deep well water residual pressure jet aeration or compressed air aeration and the like, and the pipeline mixes the dissolved oxygen.
② contact oxidation
The filter material adopts natural manganese sand filter material, and the main component is manganese dioxide (MnO 2)
when the PH of iron-containing groundwater is > 5.5, contact with natural manganese sand oxidizes Fe 2+ to Fe 3+ as follows:
a.4MnO2+3O2＝2Mn2O7 b.Mn2O7+6Fe2++3H2O＝2MnO2+6Fe3++6OH-
The generated Fe 3+ is immediately hydrolyzed into flocculent ferric hydroxide precipitate Fe 3+ +3OH - ═ Fe (OH) 3 ↓
(iii) adsorption filtration
a. removing floccules (Fe (OH) 3 precipitates) formed by Fe 3+ after the manganese sand filtration layer;
b. the majority of the yet unoxidized Fe 2+ catalyzes the oxidation and the oxidized ion exchange.
The process requires a large amount of equipment and instruments and is filtered by adding various medicaments such as natural sand, flocculating agent and the like.
first, effect data
The method for reducing the iron content in the water entering the electrodialysis system in the embodiments 1-5 and the comparative examples 1-3 of the method is used for detecting the iron content in the water entering the electrodialysis system and the existing manganese sand filtering process, and the detection results are as follows:
As can be seen from the above table, in embodiments 1 to 5 of the present invention, the iron content in the wastewater can be effectively removed by scientifically adjusting the adding amounts, mixing and stirring rates, time, and the like of the polyaluminum chloride, the cationic polyacrylamide, and the sodium hypochlorite, and compared with the existing manganese sand filtration process, the present invention can achieve an effect superior to the effect of removing the iron content in the wastewater by the existing manganese sand filtration process with less chemicals, less supporting equipment, and simpler process; compared with the comparative examples 1 to 3, the dosage requirements of the polyaluminium chloride, the cationic polyacrylamide and the sodium hypochlorite are strict, too much or too little dosage is required, the effect of removing the iron content is not optimal, and the optimal technical effect can be achieved only by scientific adjustment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A method for reducing the iron content in the inlet water of an electrodialysis system is characterized in that: the method comprises the following steps:
s1, adjusting the pH value of the wastewater to 5-8, adding 100-200 ppm of polyaluminum chloride, and reacting for 20-36 min through a pipeline mixer;
S2, adding 0.3-1.4 ppm of polyacrylamide, and quickly stirring for 12-20 min;
S3, adding 300-500 ppm of sodium hypochlorite at the outlet of the inclined tube sedimentation tank;
And S4, filtering the effluent of the sedimentation tank in a filter tank, and filtering a small amount of non-precipitated floc.
2. A method of reducing the iron content of feed water to an electrodialysis system as claimed in claim 1, wherein: in the step S1, the polyaluminum chloride has an aluminum oxide content of 8-12% and a basicity of 55-65%.
3. a method of reducing the iron content of feed water to an electrodialysis system as claimed in claim 1, wherein: in step S2, the polyacrylamide is cationic polyacrylamide.
4. a method of reducing the iron content of feed water to an electrodialysis system as claimed in claim 1, wherein: in the step S2, the stirring speed is controlled to be 600-1000 rpm.
5. A method of reducing the iron content of feed water to an electrodialysis system as claimed in claim 1, wherein: in the step S4, the filtering mesh number is 400-600 meshes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910923083.4A CN110550782A (en) | 2019-09-27 | 2019-09-27 | method for reducing iron content in inlet water of electrodialysis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910923083.4A CN110550782A (en) | 2019-09-27 | 2019-09-27 | method for reducing iron content in inlet water of electrodialysis system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110550782A true CN110550782A (en) | 2019-12-10 |
Family
ID=68741617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910923083.4A Pending CN110550782A (en) | 2019-09-27 | 2019-09-27 | method for reducing iron content in inlet water of electrodialysis system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110550782A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030491A (en) * | 2014-06-29 | 2014-09-10 | 广西融安县金鼎制丝有限责任公司 | Treatment method for water for silk reeling |
| US20180079663A1 (en) * | 2015-03-31 | 2018-03-22 | Kurita Water Industries Ltd. | Method and apparatus for treating acidic liquid containing metal ions |
-
2019
- 2019-09-27 CN CN201910923083.4A patent/CN110550782A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030491A (en) * | 2014-06-29 | 2014-09-10 | 广西融安县金鼎制丝有限责任公司 | Treatment method for water for silk reeling |
| US20180079663A1 (en) * | 2015-03-31 | 2018-03-22 | Kurita Water Industries Ltd. | Method and apparatus for treating acidic liquid containing metal ions |
Non-Patent Citations (3)
| Title |
|---|
| 中国环境科学学会编: "《中国环境科学学会学术年会论文集 2009 第2卷》", 30 June 2009, 北京：北京航空航天大学出版社 * |
| 张建丰编著: "《活性污泥法工艺控制》", 31 January 2007, 北京：中国电力出版社 * |
| 胡立锋: "结团絮凝-膜过滤组合工艺处理滤池反冲洗废水试验研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105060545B (en) | A kind of system and method for sofening treatment Desulphurization for Coal-fired Power Plant waste water | |
| CN103922517B (en) | A kind of method containing the process of heavy metal sulfuric acid wastewater containing and recycle | |
| CN108218129B (en) | Treatment method of chemical nickel plating wastewater | |
| CN104045191A (en) | Cyanogen-containing wastewater treatment method | |
| CN110510768A (en) | The combination treatment method of chemical nickle-plating wastewater | |
| CN104071953A (en) | Cyanide-containing wastewater treating method for gold mine | |
| JP2013075261A (en) | Treatment method and treatment apparatus that removes harmful substance | |
| CN105601036A (en) | Method for treating chemical nickel plating waste water on basis of ozonation and biochemical technique | |
| CN104556472A (en) | Treatment method and system for CIT heavy metal-containing sulfuric acid wastewater | |
| CN104176884A (en) | Cyanide-containing wastewater comprehensive treatment method | |
| JP2013104723A (en) | METHOD AND APPARATUS FOR TREATING Sr-CONTAINING WATER | |
| CN105330004A (en) | Reclaimed water recycling treatment technology | |
| CN104386850B (en) | Cr VI and the processing method of cyanide in a kind of electroplating wastewater of removal simultaneously | |
| CN103708679A (en) | Treatment process for fluorine chemical wastewater | |
| CN213060470U (en) | Sulfuric acid process titanium dioxide effluent treatment plant | |
| KR101990179B1 (en) | Method and apparatus for treating borofluoride-containing water | |
| CN110550782A (en) | method for reducing iron content in inlet water of electrodialysis system | |
| CN110642425B (en) | Treatment method of trivalent chromium passivation wastewater containing hydrofluoric acid and carboxylic acid | |
| CN109354314B (en) | Combined biological bed treatment process for low-carbon-source high-ammonia-nitrogen high-organophosphorus wastewater | |
| CN111635033A (en) | Method and device for treating thallium and arsenic-containing waste acid | |
| JP4396965B2 (en) | Heavy metal removal method and apparatus | |
| CN104086053A (en) | Treatment method of low-concentration cyanide-containing wastewater in gold mine | |
| JPH0592198A (en) | Softening treatment of hard water | |
| JP2001025777A (en) | Water treating method | |
| CN112299588A (en) | Method for treating industrial wastewater with high content of organic matters and arsenic |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191210 |
|
| RJ01 | Rejection of invention patent application after publication |